An Analysis of ππ-Scattering Phase Shift and Existence of σ(555) particle

S. Ishida, M. Y. Ishida, H. Takahashi +3

In most of the Nambu:Jona-Lasinio(NJL)-type models, realizing the hidden chiral symmetry, the existence of a scalar particle σis needed with a mass m_σ=2 m_q, as a partner of the N…